package com.google.code.mochaccino.framework.crypto.cipher;

/*
 * Copyright 2012 Claude Houle claude.houle@gmail.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import javax.crypto.Cipher;
import org.apache.commons.io.IOUtils;

/**
 * A simple do-final implementation that may or may not given memory issues (or worst, buffer-overflow)
 * due to the underlying cipher. As always, test with all possible data before using this cipher handler.
 * <p/>
 * When in doubt, use a Block-based Cipher Handler
 */
public class CipherHandlerDoFinal implements CipherHandler {

	@Override
	public byte[] transform( Cipher c, byte[] data ) throws GeneralSecurityException, IOException {
		return c.doFinal( data );
	}

	@Override
	public void transform( Cipher c, InputStream in, OutputStream out ) throws GeneralSecurityException, IOException {
		out.write( transform( c, IOUtils.toByteArray( in ) ) );
		out.flush();
	}
}
